syntax-check: inclusion rule for src/hypervisor

Allow it to be included by anything above mid_dirs.
Signed-off-by: NJán Tomko <jtomko@redhat.com>
Reviewed-by: NMichal Privoznik <mprivozn@redhat.com>

build-aux/syntax-check.mk

@@ -856,7 +856,7 @@ sc_prohibit_cross_inclusion:
 	    access/ | conf/) safe="($$dir|conf|util)";; \
 	    cpu/| network/| node_device/| rpc/| security/| storage/) \
 	      safe="($$dir|util|conf|storage)";; \
-	    *) safe="($$dir|$(mid_dirs)|util)";; \
+	    *) safe="($$dir|$(mid_dirs)|hypervisor|util)";; \
 	  esac; \
 	  in_vc_files="src/$$dir" \
 	  prohibit='^# *include .$(cross_dirs_re)' \